Well periphery seismic imaging detection method and device based on logging while drilling and stratum grillwork constraints

Abstract

The invention relates to a well periphery seismic imaging detection method and device based on logging while drilling and stratum grillwork constraints. Acoustic velocity data acquired by staged welllogging in the drilling process are utilized, an offset velocity field around a well hole is updated under the constraint of a stratigraphic framework; wave equation datum plane continuation is combined to achieve rapid imaging of depth offset around the well, a drilling target is relocated, and a drilling track is optimized in time. Compared with the prior art, the well periphery seismic imagingdetection method and device has the following advantages: geological reasonability can be achieved when the stratum speed provided by well logging data can be expanded from a borehole to the peripheryof the well, and the drilling success rate is increased.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to a method and device for seismic imaging detection around wells constrained by logging-while-drilling and stratum framework. Background technique [0002] In oil and gas seismic exploration, firstly through seismic data acquisition, processing and interpretation, and under the comprehensive guidance of seismic, geological and logging data, the type and characteristics of oil and gas reservoir traps are determined, and then the preferred reservoir targets are drilled. The imaging of complex structures in complex heterogeneous subsurface media usually uses pre-stack migration, especially pre-stack depth migration, as the main technical means. However, the imaging accuracy of prestack depth migration largely depends on the reliability of the depth-domain migration velocity model. In conventional seismic data processing, the depth-domain layer velocity converted from the root-me...

AI Technical Summary

Problems solved by technology

The disadvantage of this technical process is that the real-time performance is not strong, and the speed correction lacks the constraint of stratigraphic grid information

The disadvantage of this technology is that the seismic signal while drilling is weak, especially when drilling into soft rock formations, the source signal is not good, the signal-to-noise ratio is low, and the detection range is small

In short, although these technologies (especially the first one) have been popularized and useful in the oil and gas exploration industry, their limitations are obvious, especially not suitable for the exploration and development of deep and ultra-deep oil and gas resources in many exploration areas in my country

Images